Question

x + 2x -a = 0
Put x=3, (3)2 + 2 (3) - a=0
9 + 6 - a=0
15-a=0
-a=-15
a= 15
or
THINK AND DISCUSS
1. r?+ 1 has no real zeroes. Why?
2. Can you tell the number of zeroes of a polynomial of nth degree?
EXERCISE - 2.2
1. Find the value of the polynomial 4x² – 5x+3, at
1
(iv)x=
(iii) x=2
(ii) x=-1
2
(i) x=0
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Answer 1

Step-by-step explanation:

Exercise 2.2

i)x=0

4(0)^2 - 5(0) + 3 = 4(0) - 0 + 3 = 3

ii)x=-1

4(-1)^2 - 5 (-1) + 3 = 4(1) + 5 + 3 = 12

iii)x=2

4(2)^2 - 5(2) + 3 = 4(4) - 10 + 3 = 9